This is not a spoiler because we know this in the first five minutes. A respected Scotland Yard detective is dismissed because he "hanged an innocent man." I can't accept the basic premise of this story. The police simply investigate the crime and bring their findings to the prosecutor. If an innocent man is hanged, it is not the fault of the detective, but rather that the prosecutor didn't do due diligence and the defense attorney didn't call him on it. No one person is to blame if the wrong person is punished because it involves two opposing teams at work.